I agree. I actually crop *every* image I scan to remove any excess whitespace so that the images take up as little space as possible. If I forget to crop it immediately, I either have to live with it the way it is or rescan it.
Also, the rotate options provided are too limiting. Yes, most often, I will want to rotate the image 90 degrees, but sometimes I want to "straighten" it perhaps by 5 degrees.
Lastly, being able to resize the cropping window is a must. Some receipts come in at 12 inches long, but only 2 inches wide. It's hard to see what I'm cropping. Being able to adjust the cropping section would also be a great addition instead of reselecting the region again.